A Brother printer offline due to various common reasons. One frequent cause is a temporary disruption in the network connection, which can be resolved by checking cables, Wi-Fi settings, or restarting the router. Outdated or conflicting printer drivers may lead to communication issues between the printer and computer, resulting in an offline status. Additionally, paper jams, low ink or toner levels, and hardware malfunctions can trigger the offline status. System glitches or software conflicts may also temporarily disconnect the printer.